condition mean min max ZT0-3 0.01980255 0.0 0.0396051 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.04307266666666667 0.0 0.08614533333333334 ZT16-19 0.0 0.0 0.0 ZT20-23 0 0 0